Feature Film Mavericks Not Paying Extras

There is a disturbing trend in films asking extras to work for free.
AB Media Publishing, LLC

A casting call was issued for extras in the Santa Cruz area to work on the film "Mavericks". However, the production is not paying the extras. They are only offering "drawings for prizes". I do not post unpaid casting notices, and I think it should be illegal in all states to do this. I see this more and more often in different states, and I see it as being an extremely unsettling trend.